<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://unpkg.com/vue@next"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button-count></button-count>
    </div>
    <script>
        const app=Vue.createApp({
            
        })
        app.component(`button-count`,{
            data(){
                return{
                    count:0
                }
            },
            template:`<button @click="count++">点{{count}}此</button>`
        })
        app.mount("#app")
    </script>
    
</body>
</html>